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Title: Winter feeding success of stream trout under different streamflow and turbidity conditions

Author: White, Jason L.; Harvey, Bret C.;

Date: 2007

Source: Transactions of the American Fisheries Society 136: 1187-1192

Publication Series: Scientific Journal (JRNL)

Description: To investigate the relationship between turbidity and trout feeding success in natural systems, we sampled the stomach contents of resident rainbow trout Oncorhynchus mykiss and coastal cutthroat trout O. clarkii clarkii under different streamflow and turbidity conditions during winter in two northwestern California streams (total sample sizeĀ¼161). Feeding success generally did not differ sharply for fish collected under low versus high streamflow and turbidity conditions. Bioenergetics modeling suggested that feeding success on average did not reach maintenance levels for seven of eight sets of samples, but extensive feeding on oligochaetes during one period of elevated streamflow resulted in positive energy balances. Occasional peaks in food intake could greatly influence the energy budgets and growth of trout in mild-winter systems. Under some natural conditions, trout appear able to achieve relatively high feeding success when turbidity limits visibility.

Keywords: salmonids, fish, feeding success, turbidity

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  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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White, Jason L.; Harvey, Bret C. 2007. Winter feeding success of stream trout under different streamflow and turbidity conditions. Transactions of the American Fisheries Society 136: 1187-1192.

 


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